HPE Shadowbase Zero Downtime Migration (ZDM)

HPE Shadowbase Zero Downtime Migration (ZDM) software (i.e., no downtime for the application during migration) provides continuous availability, eliminates planned downtime, and removes business risk from application upgrades, as seen in Figure 1 below.

  • Provide continuous application services to all end users for complex migrations, upgrades, and conversions to achieve no application downtime:
    • Migrate to new hardware (homogeneous or heterogeneous)
    • Upgrade the operating system or database software
    • Convert from an older to a newer application version
  • Avoid the risk of classic big-bang conversions and outage windows:
    • Fully verify the new environment before deploying
    • Cutover users either gradually or at all at once to a known-working environment

Figure 1 illustrates how HPE Shadowbase software can achieve zero application downtime via a multi-node upgrade or a single-system upgrade. In both cases, the new (upgraded) database and the current database are kept synchronized by Shadowbase data replication, so that if an issue arises with the new system, it is easy to revert to the current system without incurring any downtime. This configuration also enables the stepwise migration of users from the current to the new system, enabling a controlled and safe incremental migration, as opposed to the risky, all-at-once big-bang approach. All possible migration steps are not represented by this figure; for more details, please refer to our white paper, Using HPE Shadowbase to Eliminate Planned Downtime via Zero Downtime Migration.

Diagram of HPE Shadowbase zero application downtime. Two ZDM examples, one a multi-node upgrade, the other a single-system upgrade. For a full image description, please see the paragraph that starts with "Figure 1 illustrates."

Figure 1 — HPE Shadowbase Zero Application Downtime

HPE Shadowbase ZDM Eliminates Planned Downtime
Shadowbase ZDM software completely eliminates planned application downtime and improves overall application availability. A large amount of system downtime is due to planned outages required for upgrades, maintenance conversions or migrations. The requirement could be for an operating system upgrade, a new application release, database maintenance or installing new hardware. With Shadowbase ZDM, these interruptions are handled without denial of application services to end users, therefore scheduled downtime is eliminated, maintaining continuous availability for IT business services. All that is needed is a location (on the same node or another node, depending on the type of conversion) for the new environment.

HPE Shadowbase ZDM Eliminates Business Risk
As part of the ZDM process, the new environment is synchronized with the production environment using real-time change data capture and all functions are verified before the cutover occurs. Shadowbase ZDM thus eliminates the risk of the classic Big Bang conversions and outage windows by allowing the users to cutover, either gradually or all at once, to a known-working environment.

Solution Benefits:

  • Capacity Expansion —  expand with symmetric or asymmetric nodes
  • Load Balancing —  redistribute users and partitions across the network
  • Disaster Tolerance and Data Locality —  disperse nodes geographically
  • Migrations —  in increments, or initially to an active/active environment
  • Operations —  risk-free failover/recovery testing, or run and maintain unattended sites

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